All-Optical Noise Spectroscopy of a Solid-State Spin
All-Optical Noise Spectroscopy of a Solid-State Spin
复制标题
固态自旋的全光噪声光谱
DOI：
10.1021/acs.nanolett.2c04552
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发表时间：
2023
期刊：
影响因子：
10.8
通讯作者：
Waks, Edo
中科院分区：
文献类型：
--
作者：
Farfurnik, Demitry;Singh, Harjot;Luo, Zhouchen;Bracker, Allan S.;Carter, Samuel G.;Pettit, Robert M.;Waks, Edo
噪声光谱学阐明了自旋系统中的基本噪声源，从而成为开发用于量子信息处理、通信和传感的具有长相干时间的自旋量子比特的重要工具。但是，当微波功率太弱而不能产生自旋的拉比旋转时，依赖于微波场的现有噪声光谱技术就变得不可行。在这里，我们演示了一种替代的全光学方法来执行噪声光谱学。我们的方法利用自旋态的相干拉曼旋转和可控的时间和相位来实现Carr-Purcell-Meiom-Gill脉冲序列。分析这些序列下的自旋动力学使我们能够提取密集的核自旋系综与量子点中的单个自旋相互作用的噪声谱，到目前为止，这只是理论上的模型。通过提供超过100 MHz的光谱带宽，我们的方法使得能够研究广泛范围的固态自旋量子比特的自旋动力学和退相干。
Noise spectroscopy elucidates the fundamental noise sources in spin systems, thereby serving as an essential tool toward developing spin qubits with long coherence times for quantum information processing, communication, and sensing. But existing techniques for noise spectroscopy that rely on microwave fields become infeasible when the microwave power is too weak to generate Rabi rotations of the spin. Here, we demonstrate an alternative all-optical approach to performing noise spectroscopy. Our approach utilizes coherent Raman rotations of the spin state with controlled timing and phase to implement Carr–Purcell–Meiboom–Gill pulse sequences. Analyzing the spin dynamics under these sequences enables us to extract the noise spectrum of a dense ensemble of nuclear spins interacting with a single spin in a quantum dot, which has thus far been modeled only theoretically. By providing spectral bandwidths of over 100 MHz, our approach enables studies of spin dynamics and decoherence for a broad range of solid-state spin qubits.